Calculate the intensity of solar radiation, if the useful heat (Qc) output of a flat plate collector is 820 W/m2 with effective heat loss = 4 W/m2·K and optical efficiency = 80%. The input liquid temperature = 47 degrees Celsius and the ambient temperature = 27 degrees Celsius. * (2 points)
1000 W/m2
1100 W/m2
1200 W/m2
1350 W/m2